Re: ICMP on port 3

On Fri, Dec 06, 2002 at 09:08:33AM +0100, emmanuel.siegel@ota.fr.socgen.com wrote:
> Hi
>
> i have a strange communication between two of my Linux server, it's ICMP

ICMP doesn't have ports.

ICMP type 3 are IP error messages. Type 3 code 4 is used as part of PMTU discovery and should be considered normal. Search google for more info.

There is probably something that used UDP/TCP port 3, but its not very popular. Port scanning would be my guess in that case.

   __o		Bradley Arlt			Security Team Lead
 _ \<_		arlt@cpsc.ucalgary.ca		University Of Calgary
(_)/(_) 	I should be biking right now.	Computer Science